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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.
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package com.sun.source.tree;
import java.util.List;
/**
* A tree node for a lambda expression.
*
* For example:
* {@code
* ()->{}
* (List ls)->ls.size()
* (x,y)-> { return x + y; }
* }
*/
public interface LambdaExpressionTree extends ExpressionTree {
/**
* Lambda expressions come in two forms:
*
* - expression lambdas, whose body is an expression, and
*
- statement lambdas, whose body is a block
*
*/
public enum BodyKind {
/** enum constant for expression lambdas */
EXPRESSION,
/** enum constant for statement lambdas */
STATEMENT
}
/**
* Returns the parameters of this lambda expression.
* @return the parameters
*/
List getParameters();
/**
* Returns the body of the lambda expression.
* @return the body
*/
Tree getBody();
/**
* Returns the kind of the body of the lambda expression.
* @return the kind of the body
*/
BodyKind getBodyKind();
}